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Homework 2

1 .       By what factor does [H+] change for a pH change of 2.00 units and 0.50 units?

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2 .       Calculate the pH of a solution if its [OH-] = 0.000700 M and indicate whether the solution is acidic, basic, or neutral.

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3 .       Calculate the pH of a solution if its [OH-] = 0.000700 M and indicate whether the solution is acidic, basic, or neutral.

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4 .       If the pH of a solution is 6.30, what are the molar concentrations of H+(aq) and OH-(aq) at 25°C?

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5 .       If a solution has a pH = 9.50, what are the molar concentrations of H+(aq) and OH-(aq) in the solution?

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6 .       Which of the following is not a valid expression for pOH?

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7 .       Which of the following is/are strong acid(s)?

(i) HNO3 (ii) HF (iii) HCl (iv) H2S

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8 .       Calculate the pH of each of the following strong acid solutions:

(i) 1.02 g of HNO3 in 250. mL of solution

(ii) 2.00 mL of 0.500 M HClO4 diluted to 50.0 mL

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9 .       Calculate the pH of each of the following:

(i) 15 g of HNO3 in 500. mL of solution

(ii) 8.0 mL of 3.8 M HCl diluted to 20. mL

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10 .       Calculate the pOH of the following solutions:

(i) 8.24 x 10-3M KOH (ii) 3.98 x 10-2 M Mg(OH)2

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11 .       Which one of the following values of [OH-] and pH is correct?

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12 .       Calculate the pH of a solution made by adding 2.00 g of lithium oxide, Li2O, to enough water to make 0.600 L of solution.

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